feat(app): subtask categories, live refresh on save, nested subtask fixes

carry-your-live/app/add-task.tsx

@@ -17,7 +17,7 @@ import { zodResolver } from '@hookform/resolvers/zod';
 import { z } from 'zod';
 import { useDatabase } from '@/hooks/useDatabase';
 import { database, collections } from '@/database';
-import { TaskFormData } from '@/types';
+import { TaskFormData, tagsToString } from '@/types';
 import { useSettings } from '@/theme';
 import { scheduleTaskReminder } from '@/services/notifications';
 import { useFriends } from '@/hooks/useFriends';
@@ -26,6 +26,7 @@ const taskSchema = z.object({
   title: z.string().trim().min(1, 'Task name is required').max(100),
   description: z.string().max(1000).optional(),
   categoryId: z.string().optional(),
+  tags: z.array(z.string()).optional(),
   priority: z.enum(['none', 'low', 'medium', 'high', 'critical']),
   dueDate: z.date().nullable().optional(),
   dueTime: z.string().optional(),
@@ -60,6 +61,7 @@ export default function AddTaskScreen() {
       title: '',
       description: '',
       categoryId: initialCategory,
+      tags: initialCategory ? [initialCategory] : [],
       priority: 'none',
       dueDate: initialDate,
       dueTime: '',
@@ -83,7 +85,7 @@ export default function AddTaskScreen() {
     formState: { errors },
   } = methods;
 
-  const categoryId = watch('categoryId');
+  const tags = watch('tags') ?? [];
   const priority = watch('priority');
   const repeat = watch('repeat');
   const repeatInterval = watch('repeatInterval') ?? 1;
@@ -94,10 +96,10 @@ export default function AddTaskScreen() {
   const assigneeId = watch('assigneeId');
 
   React.useEffect(() => {
-    if (!categoryId && initialCategory) {
-      setValue('categoryId', initialCategory);
+    if (tags.length === 0 && initialCategory) {
+      setValue('tags', [initialCategory]);
     }
-  }, [initialCategory, categoryId, setValue]);
+  }, [initialCategory, tags, setValue]);
 
   const onSubmit = async (data: TaskFormData) => {
     if (!isReady) return;
@@ -107,7 +109,7 @@ export default function AddTaskScreen() {
     const seriesId = data.repeat !== 'none'
       ? `series_${Math.random().toString(36).slice(2, 10)}${Date.now().toString(36)}`
       : '';
-    const resolvedCategoryId = data.categoryId || '';
+    const resolvedCategoryId = (data.tags && data.tags[0]) || '';
 
     let createdTask: any = null;
 
@@ -116,6 +118,7 @@ export default function AddTaskScreen() {
         t.title = data.title.trim();
         t.description = data.description || '';
         t.categoryId = resolvedCategoryId;
+        t.tags = tagsToString(data.tags || []);
         t.priority = data.priority;
         t.completed = false;
         t.dueDate = dueDateTimestamp;
@@ -184,8 +187,8 @@ export default function AddTaskScreen() {
             keyboardShouldPersistTaps="handled"
           >
             <CategorySelector
-              value={categoryId}
-              onChange={(value) => setValue('categoryId', value)}
+              value={tags}
+              onChange={(value) => setValue('tags', value)}
               error={errors.categoryId?.message}
             />
             <Controller